51 lines
1.5 KiB
Rust
51 lines
1.5 KiB
Rust
use std::env;
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use std::fs::{self, File};
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//use std::path::Path;
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//use std::io::BufReader;
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//use std::io::stdout;
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//use std::io::prelude::*;
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fn main() {
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let args: Vec<String> = env::args().collect();
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let mut pattern_and_filename: Vec<String> = Vec::new(); // 0 - pattern, 1 - name of files
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let mut invert: bool = false;
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for arg in 1..args.len() {
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match args[arg].as_str() {
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"--help" => {
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println!("Usage: grep [OPTIONS] FILE");
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println!("Print lines matching a pattern");
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return;
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}
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"-v" => {
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invert = true;
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}
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arg => {
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if args.len() < 3 {
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println!("grep: Not enought arguments");
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return;
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}
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pattern_and_filename.push(arg.to_string());
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}
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}
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}
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let pattern = &pattern_and_filename[0];
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let filename = &pattern_and_filename[1];
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let contents = fs::read_to_string(&filename);
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for line in search(pattern.to_string(), contents.unwrap().as_str(), invert) {
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println!("{}", line);
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}
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}
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fn search<'a>(pattern: String, contents: &'a str, invert: bool) -> Vec<&'a str> {
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let mut results = Vec::new();
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for line in contents.lines() {
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if line.contains(&pattern) && !invert {
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results.push(line);
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} else if !line.contains(&pattern) && invert {
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results.push(line);
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}
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}
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results
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}
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